4th axis feedrates


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    Default 4th axis feedrates

    Hi Tom,

    I have not used my rotary axis much for true 4th axis cutting, mostly indexing. But trying to cut a slot in a cylinder here today and having a bit of trouble. Doesnt seem like feed rates are working properly for me. Im trying to cut at 60 IPM on a 1.7 dia cylinder, 1.44 dia at tip of tool. My cam software is outputting feedrate at around 4500 degrees/min which seems right, but seems like its going way faster then this. Seems to be going to the maximum I have specified in the trajectory planner.

    The slot has a 90 degree turn, so part of it is moving only in X axis, and part of it is only in A axis, and you can tell the feed per tooth on the surface finish is way higher in the rotary moves. Any ideas? Thanks.

    Mark

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    Default Re: 4th axis feedrates

    Did a little more testing, it was definitely rotating at max speed. I looked over the help file for the trajectory planner and I see you recommend inverse feedrate for rotary axis. I switched over to inverse feed and everything seems to be working fine. Code is a bit messy looking but it works. So everything is good as far as I know. Thanks again.

    Mark

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    Default Re: 4th axis feedrates

    Hi Mark,

    Did you have a non-zero Radius specified in the Trajectory Planner? If so then the F4500 would not be degrees/min but rather inches/min at the specified radius.

    Also the feedrate is only in degrees/min with a pure angular move (no XYZ motion).

    So I think the only way to do it in general properly is to let the CAD system, that knows all the geometry, specify the motion time explicitly using inverse feed times.

    Nice part.

    Regards
    TK http://dynomotion.com


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    Default Re: 4th axis feedrates

    It was non-zero at first, then i tried zero and got some jerky motion, and finally everything worked great with inverse time.

    Just for your info, the Mazak I used to run at my last job would handle feedrate in degrees/min on any line with an angular move. Im thinking this is probably the industry standard, probably would make more sense for it to work this way if it were an easy change in the future. But in the meantime the inverse time seems to be working fine so no big deal either way. Thanks again.



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